Create a new service account or prepare the service account for signing bytes in App Engine.Ģ. For our purposes, we’re implementing the API using App Engine Standard.ġ. Using this feature, you’ll prepare an API server to generate a Signed URL dynamically for specific end users. The Google Cloud official client library makes it easy to generate a Signed URL. Signed URL makes it possible to generate temporary credentials valid only for a specific end user to securely upload a file. Generate Signed URL on App Engine standard runtimeĬloud Storage provides the Signed URL feature to let individual end users perform specific actions. Next, we will devise an actual implementation for the above steps. The copied image file is now available to the public. Once the validations in steps 3 and 4 are complete, copy the image file from the Uploadable Bucket to the Distribution Bucket.Ħ. After confirming that the file is in image format and appropriate size at step 3, annotate the image by posting to the Cloud Vision API to filter inappropriate content.ĥ. Then Cloud Functions validates the uploaded file.Ĥ. Once the user uploads the file to Cloud Storage, it triggers Cloud Functions as finalize event. Next, the user can upload a file for a specific bucket and object accordingly.ģ. Once App Engine receives a request from the user, App Engine generates a Signed URL that allows PUT requests to be executed only for a specific Cloud Storage bucket and object for authenticated users, using application domain logic.Ģ. Let’s detail each step shown in the diagram.ġ. This is the general workflow you’ll be setting up. The key characteristic of this architecture is that it uses a serverless platform from file upload to delivery. In order to satisfy the above requirements, we devised the following architecture with GCP services:
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